Rebutting Four Arguments in Favour of Resolving ius cogens Norm Conflicts by Means of Proportionality Tests

Abstract

Abstract The text casts doubt on the utility of proportionality tests to resolve conflicts between peremptory norms of public international law with reference to an argument advanced by João Ernesto Christófolo. Responding to Christófolo, the text maintains that subjecting conflicts between peremptory norms to a proportionality analysis entails judicial law-making, does not safeguard the interests protected by peremptory norms and that the use of proportionality tests cannot be justified with reference to the desired completeness of international law. Instead, the text argues that conflicts between peremptory norms should be dealt with head-on by openly acknowledging the existence of an irresolvable norm conflict and that, if at all, proportionality tests must be applied with utmost care to avoid that the interests of those undertaking a proportionality analysis prevail over the interests of those whose interests the balanced norms in questions are intended to protect.